Reference for Bekhorot 75:31

כיון דעבדו היכירא ביש לו תוך ידיע דאין לו תוך דרבנן

that is [to say], As a sack is handled either fully or empty, so anything [in order t receive uncleanness] must be in a condition to be handled either full or empty?<span class="x" onmousemove="('comment',' I.e., capable of containing.');">²²</span>

Jastrow

Jastrow

Jastrow